\documentclass[a5paper,11pt]{book}

\usepackage[a5paper, top=2cm, bottom=2cm, left=2cm, right=2cm]{geometry} 

\usepackage[T1]{fontenc}
\usepackage{arev}

\begin{document} % Let's go!
\include{title}
\tableofcontents
\include{introduction}
\include{installing}
\include{using-sos}
\include{applications}
\include{development}
\include{licencing}
\end{document}
